Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9d7bab82e42226…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 13:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffa9099749b7d43f0a21626a0996d719 SHA-1: bdec1bea66b10c31b35f27c23dd1b14b2c89ae8c SHA-256: ef9d7bab82e422266577a3ab4fedcc2eb9c1690dea1fb9602b38ac100e7a6637
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to PDF files hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=new+telugu+movies+download+2018 PDF link annotation
    • http://atomleasing.ru/media/File/7526903108.pdfIn PDF document text
    • https://obrbikes.com/files/files/96332216955.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04b2c2b54---nugewejed.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092217205573499.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/59014351507.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312595093ce---xelimenemasodes.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/45946643437.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/kenasimig.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/53723065575.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/3701591045.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144f77c85746---vudesoto.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/posufuvuxafukiz.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/weduda.pdfIn PDF document text
    • http://elitk.ru/_files/sutidixigeropefa.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210918_050822.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/ridevavufunelexoje.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/51010135389.pdfIn PDF document text
    • https://ags-car.com/upload/files/kipagixafadugeli.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/57594557791.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2d97a6aa774a46a91b899bf062a60091/68384509586.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuwapipota.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/9527857250.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 11220 bytes
SHA-256: 113b1e436bb01bade9150e36f8fc1dd3e976f70857e05402d5aa630b10add0b5
font_02_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 19028 bytes
SHA-256: ad7a58d461a5d4c9c1068564506ab043954fab218c5357721e48cd924904cca2

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